STMicroelectronics ULQ2003D1

Overview

ULQ2003D1 from STMicroelectronics is an automotive-grade seven-channel Darlington array in SO16 package, designed for high-voltage (50 V), high-current (500 mA continuous, 600 mA peak) switching of inductive loads. It integrates suppression diodes per channel, accepts TTL/CMOS-compatible inputs (VI(ON) = 2.4–3.0 V), and operates across –40 °C to 125 °C per AEC-Q100 qualification.

For engineers reviewing the ULQ2003D1 datasheet, ULQ2003D1 pinout, ULQ2003D1 application, or ULQ2003D1 equivalent, key selection criteria include output saturation voltage (VCE(SAT) ≤ 1.6 V at 350 mA), input current (II(ON) = 0.93–1.35 mA at 3.85 V), thermal resistance (RthJA = 120 °C/W), and automotive qualification scope including PAT/SYL/SBL statistical testing.

Technical Context

The ULQ2003D1 implements seven independent open-collector NPN Darlington pairs with common emitters and integrated flyback diodes - enabling direct drive of relays, solenoids, and DC motors without external clamping components. Each channel delivers 500 mA continuous collector current with 50 V breakdown rating and supports paralleling for higher current capability.

Input logic compatibility spans 5 V TTL and CMOS families, with VI(ON) thresholds defined at IC = 200–300 mA and VCE = 2 V. The SO16 narrow-body package meets AEC-Q100 Grade 1 requirements, specifying operation from –40 °C to +125 °C ambient and validated junction temperature up to 150 °C.

Key Specifications

Pinout & Package

ULQ2003D1 uses a 16-pin SOIC (SO16, narrow body) package with 1.27 mm pitch, dimensions 9.8 × 5.8 mm, and ECOPACK® RoHS-compliant construction. Pin numbering follows standard top-view convention with inputs (pins 1–7) opposite outputs (pins 10–16) to minimize PCB trace crosstalk and simplify routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Darlington array applications.

Compared with ULN2003A and TBD62083AFG, ULQ2003D1 uniquely combines AEC-Q100 Grade 1 qualification, 50 V output rating, and SO16 packaging - making it the only option qualified for production automotive body electronics with extended voltage headroom.

Availability

ULQ2003D1 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC output stages, thermal print head drivers, and LED signage segment controllers requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for ULQ2003D1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and discrete devices for automotive, industrial, and consumer markets.

The ULQ2003D1 belongs to ST's high-voltage Darlington array product line, engineered specifically for robust, low-component-count interfacing between logic-level controllers and rugged inductive or resistive loads in harsh environments.

FAQ

What is the maximum junction temperature for ULQ2003D1?

The absolute maximum junction temperature (TJ) is 150 °C, validated under AEC-Q100 stress conditions. Operation at rated current requires thermal design that maintains TJ ≤ 150 °C - achievable with board copper area or limited duty cycling at ambient up to +125 °C.

Can ULQ2003D1 outputs be paralleled safely?

Yes - outputs may be paralleled to increase total current capacity, as confirmed in the datasheet. Matching VCE(SAT) across channels ensures balanced current sharing; no external balancing resistors are needed for moderate loads (<1 A combined).

Is a current-limiting resistor required on the input pins?

No - ULQ2003D1 inputs are designed for direct connection to 5 V TTL/CMOS logic. Input current is internally limited (II(ON) = 0.93–1.35 mA at 3.85 V); adding series resistance would raise VI(ON) threshold and risk incomplete turn-on.

How does the COM pin function in inductive load circuits?

The COM pin connects the cathodes of all internal clamp diodes. It must be tied to the positive supply rail of the inductive load (e.g., +12 V) - not to GND - to provide a path for back-EMF energy dissipation during switch-off, preventing voltage overshoot at the OUT pins.